You can use some of these figures to come up with what Tx power rating would be best for you. As factory lists it a max of 20dBm then a setting of 100mW could be used as 20dBm = 100mW 17dBm = 50mW and so on.

DON'T BRICK YOUR ROUTER! AFTER FLASHING WITH THE TRAILED BUILD (the one with the router name in it linked below is the trailed build), IF YOU THEN FLASH A BUILD THAT DOESN'T HAVE NV60k IN THE NAME OF THE BUILD YOU ARE FLASHING YOU *WILL* BRICK YOUR e3200 ROUTER. ALSO reference this post regarding the newer NV60K.BINS FOR ALL Linksys E~ Series routers. Support for this unit wasn't added until build 17041, so you cannot use any build lesser than that build number, doing so will brick your unit!

If you decide to perform an upgrade to DD-WRT, such as, gain access to new features or bug fixes, do so using the nv60k builds. The appropriate files will have the following naming format: dd-wrt.v24-19342_NEWD-2_K2.6_big-nv60k.bin and as noted above, you must use nv60k builds 17041 or greater for upgrading to newer or older dd-wrt builds for this unit.

You can find additional DD-WRT builds for the E3200 on the DD-WRT file server. This builds will be located in the broadcom_k26 folder and look for the appropriate nv60k build of your liking.

It has been asked about: "how do i revert back to stock firmware?" and the answer is download the stock firmware image from the manufacturer's website, reset the router back to defaults using a 30-30-30 hard reset, then flash the stock image from within the dd-wrt webgui. After 5 minutes it should finish, you will then need to do another 30-30-30 reset and then access the stock webgui @ 192.168.1.1